Fixes for installing in Python 3 (#410)

* setup.py: Python 3 doesn't support octal numbers in this syntax

* setup.py: ensure we can actually use the install_requires

* setup.py: ensure self.www_dir exists before we write to it

* setup.py: replace 'stdout.write' with 'print()'

Attempting to work around this error thrown on line 152:

    ValueError: underlying buffer has been detached

* setup.py: create the necessary directories in Python 3

setup.py

@@ -1,6 +1,9 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 # setup.py
+
+from __future__ import print_function
+
 from grp import getgrnam
 from pwd import getpwnam
 from setuptools import setup
@@ -142,22 +145,25 @@ def __make_directories(self):
             self.log_dir,
             self.config_dir
         ]
-        map(self.__init_dir, loris_directories)
+        for d in loris_directories:
+            self.__init_dir(d)
 
     def __init_dir(self, d):
         # Could do something here to warn if dir exists but permissions or
         # ownership aren't sufficient.
         if not os.path.exists(d):
             os.makedirs(d)
-            stdout.write('Created %s\n' % (d,))
+            print('Created %s' % d)
             os.chown(d, self.loris_owner_id, self.loris_group_id)
-            stdout.write('Changed ownership of %s to %s:%s\n' %
-                (d,self.loris_owner,self.loris_group))
+            print(
+                'Changed ownership of %s to %s:%s' %
+                (d, self.loris_owner, self.loris_group)
+            )
 
         s = os.stat(d)
         permissions = oct(stat.S_IMODE(s.st_mode))
-        if permissions != oct(0755):
-            os.chmod(d, 0755)
+        if permissions != oct(0o755):
+            os.chmod(d, 0o755)
             stdout.write('Set permissions for %s to 0755\n' % (d,))
 
     def __write_wsgi(self):
@@ -170,9 +176,10 @@ def __write_wsgi(self):
 # site.addsitedir('/path/to/my/virtualenv/lib/python2.x/site-packages')
 application = create_app(config_file_path='%s')
 ''' % (config_file_path,)
+
         with open(wsgi_file_path, 'w') as f:
             f.write(content)
-        os.chmod(wsgi_file_path, 0755)
+        os.chmod(wsgi_file_path, 0o755)
         os.chown(wsgi_file_path, self.loris_owner_id, self.loris_group_id)
     @property
     def __here(self):
@@ -189,7 +196,7 @@ def __copy_index_and_favicon(self):
         shutil.copyfile(index_src, index_target)
         shutil.copyfile(favicon_src, favicon_target)
         for f in (index_target, favicon_target):
-            os.chmod(f, 0644)
+            os.chmod(f, 0o644)
             os.chown(f, self.loris_owner_id, self.loris_group_id)
 
     def __update_and_deploy_config(self):
@@ -235,7 +242,7 @@ def _read(fname):
     license='Simplified BSD',
     version=VERSION,
     packages=['loris'],
-    install_requires=install_requires
+    install_requires=[str(ir.req) for ir in install_requires]
 )